About FortiWLC 8.6.1
FortiWLC release 8.6.1 introduces new features along with important bug fixes. See sections What’s New and Fixed Issues
This release has revised the Spectrum Analyzer feature and is supported only on FAP-U models with the radio configured in the Scan Spectrum mode. Navigate to Configuration > Devices > AP and select an AP, click the Spectrum icon in the Action column. For more information, see the FortiWLC 8.6.1 Configuration Guide.